Stock Transactions And Stock-Based Compensation (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Millions			1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 02, 2021 USD ($) shares	Dec. 31, 2020 shares	May 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 $ / shares shares	Jul. 02, 2021 USD ($) shares	Jul. 03, 2020 shares	Jul. 02, 2021 USD ($) shares	Jul. 03, 2020 USD ($) shares	Jul. 16, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares to be repurchased | shares									20,000
Remaining number of shares authorized to be repurchased | shares	20,000				20,000		20,000
Proceeds from the sale of common stock, net of issuance costs | $							$ 0	$ 1,729
Preferred stock, proceeds from the issuance | $							$ 0	$ 1,668
Common shares reserved for issuance under the 2007 Omnibus Incentive Plan, shares | shares	50,000				50,000		50,000
RSU/PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost | $	$ 235				$ 235		$ 235
Weighted average period for cost to be recognized	3 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost | $	$ 241				$ 241		$ 241
Weighted average period for cost to be recognized	3 years
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock | shares			10,900
Common stock issued, price per share | $ / shares			$ 163.00
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock | shares					0	10,900	0	10,900
Proceeds from the sale of common stock, net of issuance costs | $			$ 1,730
Payments of stock issuance costs | $			$ 54
Threshold consecutive trading days			20	20
Preferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock | shares					0	1,700	0	1,700
Preferred stock | Preferred stock series B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments of stock issuance costs | $			$ 49
Preferred stock, shares issued | shares	1,720	1,720	1,720		1,720		1,720
Preferred stock, dividend rate, percent	5.00%	5.00%	5.00%
Preferred stock, liquidation preference per share | $ / shares			$ 1,000
Preferred stock, proceeds from the issuance | $			$ 1,670
Preferred stock | Preferred stock series A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares issued | shares	1,650	1,650		1,650	1,650		1,650
Preferred stock, dividend rate, percent	4.75%	4.75%		4.75%
Preferred stock, liquidation preference per share | $ / shares				$ 1,000